Japanese people have started eating a lot more western foods in recent decades, which has led to life-style related illnesses among many people.
この場合、次のような言い方ができますよ。
ーJapanese people have started eating a lot more western foods in recent decades, which has led to life-style related illnesses among many people.
「日本人はここ数十年間で欧米の食べ物をたくさん食べるようになり、これは多くの人々を生活習慣病に陥れた」
ここの「陥る」は to lead to を使って表現すると良いでしょう。
ご参考まで！
カナダ 
